HPE EVA Storage

EVA 4100 Performance RHL 5

 
Jose Padilla
New Member

EVA 4100 Performance RHL 5

Hi I have an EVA 4100 with 2 Qlogic switches connected to my BladeCenter C HP.

I've installed a RHL5 on one blade and is working fine but the performance is ok at the beginning and get slow after write on the disk.

Step by Step Test
The Linux is booting from SAN and then I presented a LUN (/dev/sdc).

When I test the throughput it gets 300MB/s then a use fdisk and create /dev/sdc1 and test again and throughput still is 300MB/s then I mount the partition and the throughput still is 300MB/s but when i write something on the mounted partition (dd if=/dev/zero of=/mnt) and test again the throughput downs to 40MB/s.

We measure the throughput with cat command (cat /dev/sdc1 > /dev/null) and view the throughput with iostat -m | grep sdc.

In order to probe we delete sdc1 and made the test again but the throughput still is 40MB/s.

I don't understand why it get slower than before writing on it.


My /etc/modprobe.conf
alias eth0 bnx2
alias eth1 bnx2
alias scsi_hostadapter cciss
alias scsi_hostadapter1 qla2xxx_conf
alias scsi_hostadapter2 qla2xxx
alias scsi_hostadapter3 qla2300
alias scsi_hostadapter4 qla2400
alias scsi_hostadapter2 usb-storage
options qla2xxx ql2xmaxqdepth=16 qlport_down_retry=30 ql2xloginretrycount=30 ql2xfailover=1 ql2xlbType=1 ql2xautorestore=0xa0 ConfigRequired=0
remove qla2xxx /sbin/modprobe -r --first-time --ignore-remove qla2xxx && { /sbin/modprobe -r --ignore-remove qla2xxx_conf; }


My Linux Version
Linux cppapp.tigo.net.bo 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:14 EST 2007 x86_64 x86_64 x86_64 GNU/Linux


Thks
Jose Padilla


1 REPLY 1
Jose Padilla
New Member

Re: EVA 4100 Performance RHL 5

Sorry the switches are Brocade and the HBA are Qlogic